In many technical logs and database entries, files with numeric names like "7428" are often associated with:
did you find this file? (e.g., a specific website, a NAS drive, or a cloud folder) Do you know the approximate length or content of the video? 7428.mkv.mp4
If you found this file in a download directory, it is likely a clip or segment from a larger production that has been stripped of its metadata for easier automated handling. In many technical logs and database entries, files